Kvm switcher with ability to extend universal serial bus (usb) host interface via serial peripherial interface (spi)

Abstract

A multi-computer (KVM) switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI), characterized in that SPI master device interface of master control unit can switch the capability of controlling plural SPI slave devices via serial peripheral interface (SPI), and through installing SPI slave device interfaces on plural universal serial bus (USB) host interface control units to be extended, the object of extending peripheral device with USB interface via SPI interface is achieved.

1 . A KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI), including:
 a serial peripheral interface (SPI) master control unit, equipped with a SPI master device interface; and   at least one universal serial bus (USB) host interface control unit, equipped with an USB interface connecting to at least one peripheral device with USB interface, and equipped with SPI and SPI slave device interface connecting to the SPI master device interface of the serial peripheral interface (SPI) master control unit;   characterized in that the SPI master device interface of the master control unit can switch the capability of controlling the plural SPI slave devices via serial peripheral interface (SPI), and through installing the SPI slave device interface on the plural universal serial bus (USB) host interface control units to be extended, the object of extending peripheral device with USB interface via SPI interface is achieved.   
     
     
         2 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 1 , wherein the multi-computer (KVM) switcher further includes at least one USB device control unit, and the USB device control unit directly or indirectly electrically connects to a computer, and is equipped with a SPI slave device interface, and the SPI slave device interface of each of the USB device control unit electrically connects to the SPI master device interface of the SPI master control unit, and the SPI slave device interface of the USB host interface control unit. 
     
     
         3 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 2 , wherein the SPI master control unit, the USB host interface control unit, and the at least one USB device control unit communicate via SPI signals; the SPI master control unit can switch and select a specific USB device control unit among the at least one USB device control unit, and assign the signal of the USB host interface control unit to the specific USB device control unit, so that the peripheral device with USB interface connecting to the USB host interface control unit can connect to the computer corresponding to the specific USB device control unit. 
     
     
         4 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 1 , wherein the peripheral device with USB interface is a keyboard with USB interface or a mouse with USB interface. 
     
     
         5 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 1 , wherein plural USB hubs are further included, and electrically connect to the at least one USB device control unit, respectively, and the at least one USB device control unit indirectly electrically connects to the corresponding computer through the at least one USB hub. 
     
     
         6 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 1 , wherein an USB switch is further included, electrically connects to the SPI master control unit and the at least one USB hub, and connects to the at least one device with universal serial bus (USB) interface, and the SPI master control unit can control the USB switch to assign the signal of the device with universal serial bus (USB) interface to the at least one USB hub. 
     
     
         7 . The KVM switcher with ability to extend universal serial bus (USB) host interface via serial peripheral interface (SPI) as claimed in  claim 6 , wherein the device with USB interface is a storage device with USB interface.